* {
  margin: 0;
  padding: 0;
}

html,
body,
#root {
  height: 100%;
  background-color: #2d3a4b;
  overflow: hidden;
}

.app {
  display: flex;
  flex-direction: column;
  margin: 20px auto;
  width: 80%;
  height: 70%;
  border: 1px solid #000;
  background-color: #fff;
}

.header {
  padding: 0 20px;
  height: 68px;
  line-height: 68px;
  font-size: 24px;
  user-select: none;
  border-bottom: 1px solid rebeccapurple;
}

.main {
  display: flex;
  flex: 1;
}

.left {
  width: 100px;
}

.right {
  padding: 20px;
  flex: 1;
  background-color: bisque;
}

.link {
  display: block;
  padding: 0 20px;
  height: 40px;
  line-height: 40px;
  border-bottom: 1px solid yellowgreen;
}

.link.abcd {
  color: #fff;
  background-color: aquamarine;
}
